Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7e2d1e5baf1dcd…

MALICIOUS

PDF

73.1 KB Created: 2021-06-01 10:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f708a342438da9ce0f23641843a7079d SHA-1: 170fe27f16fa4ba0d5d4d37164de4e5988af9e28 SHA-256: fe7e2d1e5baf1dcd839013eb7d69f904cfcc6df017aa7161f7443ca5f661cf74
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/pbw?utm_term=que+es+una+sentencia+en+programacion PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468551/normal_6000f2bf61eba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422137/normal_6030ee7a1a745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462697/normal_603b2d8a03775.pdfIn PDF document text
    • https://jadikabejoza.weebly.com/uploads/1/3/2/7/132740193/5234314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_60158e8f676d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_6023e6013eda0.pdfIn PDF document text
    • https://widobane.weebly.com/uploads/1/3/4/3/134340358/ferawapazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411250/normal_6001dd9603a62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_60141fea501b4.pdfIn PDF document text
    • https://tiwokixaxuvap.weebly.com/uploads/1/3/4/2/134235176/gofevi.pdfIn PDF document text
    • https://dubuweni.weebly.com/uploads/1/3/1/6/131637072/labekiwub_mobuvawowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_5ffe49752480f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_604987ae1c601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_60303a24c4cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_6048de35ed23c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://venatulafiz.pbworks.com/f/how_to_test_insulation_resistance_using_megger.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/f/18843307773.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/f/1585281092.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144451434/10104884749.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/xuwinifonugis.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/f/popewaxu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 5280 bytes
SHA-256: b7a641d92512417e0ec0d891033c61e8cb3479ec61a8f4953268f96fdcb85df0
font_01_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 11668 bytes
SHA-256: 17d1e1e98f08ad3fdb8e33277d5cedd38f61771c0c715e3d77cac988b0c52271

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